Insulator



April 8 1924.

L. STEINBERGER INSULATOR Filed July 23, 1919 SM \\\\\\\\\\\h\\v 4 v 4 va??? ix IN VENTOR Louis sfmber 'gei' vA BY W iwuh iwv Mrmm z'r construct an*insulator the Patented Apr. 8, 1924.

LOUIS summons, or naooxmm, NEW Yo'axj nvsuni'roa. Application filed Jul 23, 1919. .Scrlal no. 312,668.

To all whom it may concern:

Be it known tha't'I, Lorne S'remanncsn, a citizen of theUnited States anda resident of the rough of Brooklym'city and State of New York, have invented certain new and useful Improvements in Insula tors, of which the following is a specification'.

This invention relates especially to an improved and novel I; e of insulator, for use in conjunction W1 ordinary li tning arrestem, transformers-or other e ectrical apparatus to prevent damage or'destruction thereof by high frequency electrical disturbanc'es; such as lightning.

One of the objects of the invention is to conducting elenient of which is provided with a choke coil structure encased within the of insulatingmaterial so constructed an arranged that the several parts may bereadily assembled and disascmbled.

Another object is to construct an insulator the conducting element of which is provided with a choke coil structure in' connection with the conductor all of which is embedded intho body of insulating material.

Another object of the invention isto construct an insulator the conductin clement of J which is provided with a c oke coil structure in combination with a static shield stnicture for supporting the insulator and for redistributing the electrical stresses and stfrains throughout the central portion thereo Other objects will ugpear from the subjoined specification an claims.

Referring to the drawin in which the same reference character in icates the same part in the several views: i

Fig. 1 is a vertical longitudinal section of an' insulator embodying my invention with the conductor and choke coil in elevation. a

Fi 2 is a view similar to Fig. 1 of a modi ed form oE-my invention with the choke coil in section.

In the drawings, A represents a body of insulating material which may beformed projecting hoods 10, 11 and -12 graded in which has two diameters in horizontal cross section as at 20 and 21. The uper portion thereof at 20 is of sufficient iameter to neatly fit 'the conductor G which is provided at its upper and lower ends with screwthreads at 23' and 24, as indicated,

for the purposeof connecting thereto thete'rmi'nal line wire, as well known.-

Throughoutrthe lower portion of the insulator body is the cavit 21 of suflicient cross section to receive t e enlargd ends of a choke coil 30 formed from the wire .of the conductor, as shown.

The choke coil 30 is in the form ,of inversely disposed helically wound conesintegrally connected together at their apices,

the base .of the upper cone fitting against the end wall of the cavity 21. A plug or stopper B of insulating material provided.

with a central conduit for the tion of the conducting wire, is screwthreaded on its outer surface, which'engageswith the scrcwthreaxls on the lowermost portion oi -the inner wall of the cavity 21 so that whim put into place it fits against the base of the lower (one portion of the choke coil and holds the choke coil tightly and snugly within the upper portion of the cavity 21.

As stated above, the iiisulator body may he made either of moldable insulating 'material, such as elcctrose, or of fireproof insulating material such as porcelain, and in either case it is so she that the central portion thereof neatly ts within the sleeve i extending from the flange D which-lattcr is provided with bolt holes d for securing the same to a suitable support not shown,

When the body is fitted within the sleeve the lower portion of the flange at 9 fits on the upper portion of the headed the sleeve.

In the construction shown in Fig. 1 the lower porspace 1 immediately surrounding the choke coil is air filled. 1

The structure shown in Fig. 2 differs from that shown in Fig.1 in that in Fig. lthe body of insulating material'A and the pin portion B of insulating material which ho] a the choke coil on thewire in place are each separable from the otherso'that in order to dismantle the entire structure it is only necedge 8 of withinand around thecoi conductor so that but and essary to; removdeieforom the other, whereas in Fig. 2 the body tiiiulating material A is formed of suitable iulatin'g material such as electrose and is molded .inthe shape shown aroundthe conductor and chckecoil, the insulating material entering between the. turns of the coil, thus filling the entire space and aroundthe one 'solid body is formed; 1 I

' From the above description in connection with Figl'l it will be seep the insulator construction is such that I place within the approximate central portion of the insulator, portions through the upper as well as the wer rtion of'the insulator, the line wire {riot shown) being connected to the same atone extension and J the other extermign being eonnec 'to apparatus or groun as m y be desi rzd.

Thc'compound structure, as indicated,is as follows: A is the body of theinsulator, B the removable plug section and is the choke oil within the centre ortionof the msulaton, D is the supggrtmg flange for the sleeve-like static shie which is molded or placed about the body of the. insulator at its approximate center. A s or cavity E is provided within the ofirthe insulator wherein the choke coil is disposed and installedl. Y f

The insulator body A may be mold'edand when molded isgpi'ovided with an aperture extendin axially therethrough. The aperture, as s owffin Fig. 1, has an enlarged portion extending from a !paint ap rox mately above' the center of the of t e insulator from there on upwa y the aperture is reduced in size suflicientl to. allow the conducting wire to extend erethrou F The insulating plug B is farms e'di'with a centrally disposed aperture 22 gh i g, therethrough for the-purpose of receiving the lower portion of .th from the choke coil. l

In assemblin the insulator the upper portion of the con uctor is assed' through the axial conduit arranged t erefor in the body of insulating material and the choke coll takes a, suitable E in the body 0 insulating material. The plug member B is then fitted to the lowerportion of the conductor and screwed into the insulator up to a point where it contacts with the lower portion of the choke coil, thereby supporting the choke coil in its' operative position g It is of course obvious that this insulator may also be used in a horizontal position, in which case the'plug B is not really necessary to support the choke coil but simply closes up that end of the insulator and completes the insulation thereof. Thechoke coil illustrated in the embodi- 'conductor extending ment of the invention as disclosed in Fig. 1 is at all times removable, whereas the choke coil in Fig. 2 is permanently fixed to the body of insulating material.

From reciated'that the choking device which I avepr'ovided will retard instantaneous rush theabove description it will be op or surge of electrical current through the electrical apparatus in the event that-the conductor passing through the insulator is 7 charged by a stroke of high frequency electrical similar nature, this protectin mentioned electrical apparatus in such an event a ligh choking device.

By means of this invention, abnormally high voltage current p vented from a'ssing through the electrical equipment, w ile an ordinarycurrent-will flow alonfilthe conductor, 'astthe choking device wi out difliculty,w ere. the. number of turns of the helix formin th'e'cho device isof proper ratiottie? current flowing through the conductor.

The sleeve attached to the" suppoitiii flange upon which the insulator is'mount'e and which encircles the central body so of the insulator causes'a'static'shiel efl'ect .by redistributing the field andpreventing' 4 which serves -proconcentration thereof: long the life ofthe'insulatonwithin tended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted ate-illustrative and not in a limiting sense.

Having thusdescribed my invention what I claim as new and desire 'ters Patent is:- Y

igiliitning or other i nin arrester, for-- into stance, suflicient opportunity to act before the high frequency current can pass theito secureby- Let'- I "il u an re-V '88 rtion as changes of construction'could'be made loo the scope of 'my inve'litionjit is in- 1. In a device of the class described an 1 choke coil secured in said insulator body;

having conductors secured thereto which 'ex-' lator b choke coi stresses set said sleeve==coactin to redistribute the e ectrostaticup in the insulator.

elongated body of insulating material, a

surm ositiom within the cavity roundmg the central portion of said insuwith the 2-. In a device of he class described, air- 1:0 elongated body of insulating material heving an annular shoulder formed on the-u 'per portion thereof, a choke coil secured insaid. insulator-body havin conductors so cured thereto which exten posite ends of said insulator body, anda metallicsupporting ring having a sleeve with. annular'beads formed on its opposite edges, said sleeve surroundin the central portion of said insulator beyond the jop- 126 y, the upper bead of saidsleeve engaging the shoulder formed on said insulatorbody to support the same.

3. In a device of the class described, an elongated y of insulating material having'radially projecting hoods formed on the upper portion thereof and graded in diameter from top to bottom and a supporting shoulder formed below the lower hood, a choke coil havi oppositely extending'conductors connec thereto and projecting beyond the ends of said insulator body, a supporting ring having a sleeve formed thereon wh1ch surrounds the central portion of the insulator body, the upger edge of said sleeve being rounded an engagin the shoulder on the insulator bod fiower portion of said insulator bo y being of \slightl smaller diameter than the interior of sai sleeve to permit the insertion of the the .trostatic stresses set upl insulator bod I with said eho e coil to redistribute the 61801 in the insulator.

; 4.- In a device of t e class described, a

of insulatingn'iaterial, an electrical bod conductor extending therethrough and having a straight portion fitted in an aperture in said insulator and a choke coilportion contactin with said insulator'bod and a metallic s eeve surrounding said sulating material throughout substantially the length of said choke coil portion of said conductor.

In witness whereof, I have hereunto set my hand at the boron anilstate of New Yor this 22 day of July, 19

LOUIS STEINBERGER. In presence of' Zrra M. GRAHAM.

therein, said sleeve enacting h of Manhattan, city 

